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MATRICES — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsMATRICES1 Mark
Question
If $\text{A}=\displaystyle \begin{vmatrix} 1 \\ 3 \end{vmatrix}\text{B}=\displaystyle \begin{vmatrix} -1 \\ 4 \end{vmatrix}$  then $ 2\text{A}+\text{B} =$
  1. $\displaystyle \begin{vmatrix} 10 \\ 9 \end{vmatrix}$
  2. $\displaystyle \begin{vmatrix} 10 \\ 1 \end{vmatrix}$
  3. $\displaystyle \begin{vmatrix} 1 \\ 10 \end{vmatrix}$
  4. $\displaystyle \begin{vmatrix} 1 \\ 9 \end{vmatrix}$
✓

Answer

  1. $\displaystyle \begin{vmatrix} 1 \\ 10 \end{vmatrix}$

Solution:

$2\text{A+B}=|26|$

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